I was on my way to work to nashville, When I stopped at the stop sign at indian lake rd I noticed somthing out the top of my window, This thing looked to be about 200 ft off the ground just sitting still it was round ring with three very long arms that came to a point, It also had what looked like a crown or lots of pointy rods going all around the top of the circle,there were no light or bright colors it just looked gray or silver white.If I had to put a size on it I would say the circle was about 40 to 50 ft across the arms looked about a hundred feet long some shorter than the others and the crown on top looked to be 40 to 50 ft tall I may be wrong but it looked very large. I decided to get out of the car to takr a better look, I thought it had to be some kind of baloon for advertising or somthing when I got out it started moving not in a motion like a plane but up and down in the same place, then it rotated and just bliked out like you turned out a light. I have never seen anything like this before and am quite disturbed, I hope it is somthing military or some kind of projected image.